Method of manufacturing gearing



A. H. LEIPERT. METHOD OF MANUFACTURING GEARING.

APPLICATION FILED 050.14. 1920.

1,412,185. Patented Apr. 11, 1922 anon x 601,

on the shaft in a novel manner.

AUGUST H. LErPnRT;

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To all w from it ma comma Be itltnowhthiit I, Anoir's'r H; Lan -ea a citizen-of the United States, residing in the borough of Queens of the'ity of N'e'w York, in' the State of New York, have invented certain neivand u eful Improvemerits in Methods of Manufacturing Gearing, 'of which the following is aspecification,

reference being had to the accompanying drawing, forming a part hereof,

This case is a divisioh of applicants 'copending applicationser, No. 348,448, filed Dece'ni-ber 30th; 1919. The invention is con cerned with an improved method of manufacturing gearing in which, where more than one gear or other partis carried on a shaft, there is a gear integral with the shaft. More particularly, the immediate problem has arisen in double reduction gearingin which two gears are carried on a shaft in close juxtaposition to eachother, these gears being of different diameters to afford the desired reduction.

In manufacturing such a construction in which one gear or pinion is'integral with the shaft it becomes exceedingly difficult, if

not impossible, to carry on satisfactorily'the. operations of cutting and grinding this 111- tegral gear by reason'of the interference with the necessary tools of the other gear or part which is carried on the shaft in close juxtaposition to the first named gear. accordance with the improved method of manufacture, it is proposed, to cut, harden and grind the gear which is integral with the shaft and then fix the other gear or part In the illustrated embodiment, for instancejthere is shown a pinion integral with the shaft and a bevel gear carried on the shaftin close juxtaposition to the pinion, the improved method of manufacture contemplating the cutting, hardening and grinding of the pinion before the bevel gearand its hub ring separable from its hub, shrinking the hub on the shaft and then securing the rmg' gear to the hub. The improvement will appear in greater detail hereinafter in connection with the description given with reference to the illustrated embodiment in the draw -;a1'id double reduction" serial i 430,706.

in section and partly in el and assembled ven'tion. V

As stated hereinb'efo'r'e, while this specifi- H pvati'on a shaft V I gearingcpnstiucted in accordance with the in cationwilldescribe the 'improved nie tliod of manufacturing;with ref rence to a pro,-.

ejre. are provided double iie. V

duct in whiclit V duction gears on a. slngle shaftyo ne of wl re t n e r li i f w'i tlt i to h' 'ii eir "s'tOoCt that some 7 other elenieiit than the de tached gear maybs iiioiinted' fin' the shaft to advantage in accordance withv 'th' '1 I proved method. I

.As shown in the drawing, spur pinion a is-formed integral with the pinion shaft Z), on which is carried a bevel gear 0, secured by bolts 0' to a flanged of its hub ZJT The elements thus far described in their intended relationship Wlll have the 'hub d of l the bevel gear 0 in close juxtaposition to and,

usually,,in abutme'ntwith the spur pinion a. iVith'thepartsinthis relation it isobvious that 1n manufacture the necessary:

clearancefor the operation of the tools en'i ployedin the cutting and grinding of the spur pinion 1 1s not afforded. 1 Accordingly,

it is proposed by the improved method to meet [this difliculty by cutting, hardening andgrinding the spur pinion a on the shaft 6 before the other gear a with its hub d is applied tolthe shaft. WVith the hub cl and V the bevel gear 0 removed from the shaft it is evident that the cutting andigrinding operations on the pinion a may be effectively performed- After the, spur pinion a is'cut, hardened and ground, there is presented the problem of affixing the gear 0 to the shaft '3) in such manner as to insure such rigidity and durability as'will betantamount to integrality. In attaining this end, it ispro posed to heat the hub (Z and shrink it on to the shaft Z), a key-e being preferably emv.ployed as'a supplemental holding element. The inner face of the hub d" may abut against the proximate face of the pinion'a.

As alfinal safeguard in fixing the hub d securely on the shaft 6 a lock nut f may bev threaded on to the shaft 6 against the'hub (Z and finally locked in place by meansof a lock' wire g encircling the nut and'sprung over a grooved stud h which passes through the nut into the shaft. With the hub 03' thus securely affixed to the shaft 5 there may be attached thereto the ring gear a or other part. The simplest means for facilitating the attachment of the gear 0 to the hub cl is illustrated, wherein the hub cl is provided with a cylindrical flange (Z shouldered, as at d to afford a substantial bearingsurface for the inner periphery of the ring gear a. The flange (Z may have suitable bolt holes d drilled and reamed therein after the hub d is aiiixed to the fore the application to that shaft of a second gear or other part.

The method is defined in the accompanying claims in language which will indicate the scope of the invention.

I claim as my invention.

1. The herein described method which consists in cutting, hardening and grinding a gear integral with a shaft, shrinking a hub on the shaft injuxtaposition to the gear and then securing a member to the hub.

2. The herein described method which consists in cutting, hardening and grinding a pinion integral with a shaft, shrinking and keying a flanged hub on the shaft with one face in abutment with the proximate face of the pinion, locking the hub in place by a lock nut, drilling and reaming bolt holds in the flange of the hub and bolting a ring gear to the flange.

This specification signed this tenth day of December, A. D. 1920.

:AUeUsT H. LTEIVPERT. 

